Furnace.



PATEN TED APR. 19,. 1904.

No. 757,536. 0. WUNDRAOK. I

FURNAGE."

APPLIQATIOK FILED MAY 31, 1902. H0 MODEL. 3 SHEETSSHEET B.

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N0. 757,536. PATENTED APR. 19, 1904. 4 0. WUNDRAGK. 7'

FURNACE.

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UNITED STATES Patented April 19, 1904.

OTTO WUNDRACK, OF CHICAGO, ILLINOIS.

FURNACE.

SPEGIFIGATIOK forming part of Letters Patent No. 757,536, dated. April 19, 1904.

Application filed May 31, 1902. Serial No. 109,626. (No model.)

To all whom it may concern: Be it known thatl, OTTO WUNDRAGK, asubect of the Emperor of Germany, residing at Chicago, in the county of Cook and State of parts omitted. Fig. l is a view of one of'the grate-bars. Fig. 5 is a section on line 5 5, Fig. 4. Fig. 6 is a section through the controlling device for admitting the air. Fig. 7 is a front view of the same with parts omitted. Fig. 8 is a front view of the furnace. is a section on line 9 9, Fig. 1:

Like letters refer to like parts the several figures.

My present invention relates to the construction of the grate of the furnace and also to a construction and arrangement for consuming the smoke produced by the fire. In the construction illustrated in the drawings I have provided on each side of the grate aseries of openings or passage-ways A, B, and 0, through which air passes. The front doors throughout vof the grate are preferably kept closed, so that no air is admitted except through these passage-ways A. B, and O. The passage-ways C, of which there is one on each side of the grate, pass from the front to the back of the furnace along the side, so that the air passing therethrough becomes heated. This air then enters the chamber C at the back of the furnace and passes through the opening 0 below the grate, so as to supply the fire with oxygen. In this instance it will be seen that the fire is supplied with heated air instead of cold air.

The passage-ways A, one on each side of the grate, pass along the sides of the furnace and then pass upwardly and connect with the chamber A back of the grate.

which the air strikes.

Fig. 9

' The grate is made up of a series of hollow grate-bars D,connected at one end to the chamber A and at the other end to the chamber A so that the air from the passage-ways A enters the chamber A and passes through the grate-bars into the chamber A These gratebars are preferably bent or formed with obstructing-surfaces against which the air strikes in its passage through them. This result may be produced in various ways, and, as herein shown, the grates are made with waves or wave-shaped, the several parts being bent out of alinement, as it were, so as to form the obstructing or deflecting surfaces D, against The air in passing through these grate-bars cools them and prevents them from being burned, and at the same time the air is heated to acomparatively high temperature. This air after passing through the grate-bars enters the chamber A and then passes along on each side of the grate to the rear thereof and then upwardly into the chamber A This chamber A runs along the back of the grate and is provided with a series of openings A, through which this heated air passes, said heated air striking the smoke as it is passing from the grate. Since this air is at a high temperature, it will consume the smoke,

causing the carbon to be burned. The air entering the passage-ways B passes back and forth along the'hot sides of the grate and-then enters the passage-way B, extending across the top of the grate, and then communicates with the chamber Btwhich extends along the full length of the grate. This chamber is provided witha series of openings B, which correspond to the opposite openings A. in its passage through the various passageways in proximity to the fire becomes heated to a comparatively high temperature and then passes out through these openings B. and strikes the smoke as it comes from the grate, the hot air consuming the carbon, and thus preventing smoke. from the several opposed openings A and B thus commingle, as it were, and the entire area through which the'smoke passes is thus-covered and all of the smoke consumed.

The opposed openings B and A are located,

The air I The two blasts of hot air i contracted part of the passage-way through which the products of combustion pass and are opposed to each other, so that the currents of heated air are forced toward each other. These currents of air meeting at this point hold the soot momentarily until it is burned by the fire, the heated air aiding in this process. The arch or projecting part provided with the openings A is also an important fea' ture in the practical working of my invention.

As shown in the drawings, I have illustrated the air passing through the hollow grate-bars as being used when heated to aid in consuming the smoke; but it is of course evident that this air might be disposed of in other ways. It is further evident that the several passage-ways may be varied in construction, arrangement, and number and that the other parts may also be varied without departing from the spirit of my invention. I therefore do not limit myself to the construction shown.. The passage-ways A, B, and C are provided with means for controlling the amount of air admitted thereto. As herein shown, this means consists of a rotatable controlling device E at the end' of the passageway, which may be moved so as to vary the opening through which the air is admitted or to entirely close said opening, said controlling device preferably provided with a suitable handle or the like E, by which it may be easily manipulated.

It will be noted that since the discharges or openings B and B communicate with the flue or discharge for the furnace the draft produced by the fire will also produce a draft in these several passage-ways, so as to draw the air through them while the fire is burning.

As herein illustrated, the air passes to the back of the grate through the passage-ways A'at the sides and then passes in a forward direction through the grate-bars and then passes back along the sides of the grate through the passage-way A into the chamber A This chamber A 'extends along the wall in proximity to the face of the contracted opening through which the gases pass, and there are provided a series of separated openings connecting this chamber with the said contracted opening, so that the air is divided into a series of separated streams. The chamber B extends along the wall near the passage-face of the contracted opening and is provided with a series of similar separated openings. It will also be noted that the currents of air forced toward each other on the opposite sides of this contracted opening are independently regulated, so that the amount of air and the force with which it is projected may be properly regulated and the best results secured. The

1 desirability of this feature will be readily seen when it is remembered that the upward current through the contracted opening is not uniform across the entlre area of this space.

I claim 1. A furnace comprisinga series of hollow grate-bars provided with connections which lead to the external atmosphere by means of which air may be drawn therethrough, a contracted opening above said grate-bars through whichthe products of combustion pass,a chamher in the wall opposite one face of said contracted opening and extending therealong, a

connection leading from said hollow gratebars to said chamber, a forwardly-projecting part in front of said chamber provided with a substantially vertical face and a series of separated openings in said face and connecting said chamber with said contracted opening.

2. A furnace provided with a series of passage-ways associated therewith through which air is passed so as to become highly heated, and which passage-ways discharge substantially horizontally on opposite sides of the furnace above the fire, so that this heated air is brought into contact with the smoke from the fire so as to consume it, the discharge-openings" on the opposite sides of the furnace opposed so that the currents of air are forced toward each other and a series of hollow gratebars connected therewith so as to form parts of some of said passage-ways and through which a portion of the air passes so as to cool the grate-bars;

3. The combination with a furnace of a series of hollow grate-bars, a passage-way at the side of the furnace leading to the rear thereof, a connection between said passage-way and the rear end of said hollow grate-bars, asecond passage-Way in the wall of said furnace and a connection between the front of said bars and said passage-way, a contracted open ing above the grate. one or more dischargeopenings in .the wall thereof, said dischargeopening connected with said passage-way.

4. The combination with a furnace of a series of hollow grate-bars, a connecting-chamber at each end thereof, two passage-ways in the wall of the furnace, one leading to the external atmosphere and to the connectingchamber at one end of the grate, the other leading from the connecting-chamber at the other end of the grate to a point above the grate-bars.

5. A furnace comprisinga series of hollow grate-bars provided with connections which lead to the external atmosphere, by means of which air may be drawn therethrough, said grate-bars also provided with a connection leading to the furnace-chamber above the grate, a passage-way leading along the side of the furnace so that the air therethrough will be heated, and provided with a connection leading to the furnace chamber above the grate said connections provided with opposed discharge-openings so that the currents of air are forced toward each other above the fire,

' thus coming into contact with the smoke, and

means for independently regulating the currents of air Supplied to the opposed dischargeopenings.

6. A furnace comprising a series of hollow grate-bars provided with connections which lead to the external atmosphere by means of which air may be drawn therethrough, a contracted opening above said grate-bars through which the products of combustion pass, a chamber in the wall opposite one face of said contracted opening and extending therealong, a connection leading from said hollow gratebars to said chamber and aseries of separated openings connecting said chamber with said contracted opening; a second chamber in thewall opposite the other face of said contracted opening and extending therealong, a series of independent openings connecting said chamber with the contracted opening and a passageway connected with said chamber and 29 extending along the side of said furnace, said passage-Way communicating with the exter nal air and means for separately and independently regulating the current of air passing through the openings on the opposite sides 5 

